Archerite Nelmes R J, Meyer G M, Tibballs J E Journal of Physics C: Solid State Physics 15 (1982) 59-75 The crystal structure of tetragonal KH2PO4 and KD2PO4 as a function of temperature Sample: T = 263 K _database_code_amcsd 0013167 7.4794 7.4794 6.995 90 90 90 I-42d atom x y z occ U(1,1) U(2,2) U(3,3) U(1,2) U(1,3) U(2,3) K 0 0 .5 .0259 .0259 .0163 0 0 0 D .14736 .22010 .12113 .5 .0205 .0238 .0255 -.0005 -.0026 -.0033 P 0 0 0 .0139 .0139 .0174 0 0 0 O .14839 .08108 .12554 .0182 .0184 .0227 .0025 -.0072 -.0049